A woman wearing a niqab walks in the Tuileries Garden in Paris, France. The country introduced a ban on the veil in April. Photograph: Reuters

A court this week heard the first case against women for wearing the niqab – or Islamic face veil – since a ban came into force in April. One of the defendants was banned from entering the courthouse because she was still wearing the niqab.

The two women on trial were stopped in the street on 5 May near the town hall of Meaux, east of Paris. The mayor, Jean-François Copé, is an architect of the ban and head of Nicolas Sarkozy's ruling rightwing UMP party.

The women were wearing their niqabs during a demonstration against the law. They were supported by the Don't Touch My Constitution group, which has led protests against the ban.

One of the women, Hind, who is 31 years old, was not allowed into court because she refused to remove her niqab at the request of a police officer. She offered instead to lift it for an identity check. "I can't be present at my own trial. I'm being denied the right to express myself," she said outside. The other woman was not present.

Under the controversial law backed by Nicolas Sarkozy, any Muslim woman wearing a face veil is now banned from all public places in France, including streets, trains, courts and school premises.

The state prosecutor requested that each woman be fined €150 (£132) and made to attend a citizenship class. The women's lawyers argued that the law was politically motivated and "inapplicable".